This is the one reason I care so much about emulation. As old hardware starts to fail and degrade, we are increasingly at risk of losing old software. We have libraries and museums to preserve other forms of literature and art, but emulation is often treated with contempt.
Software is more than just the static words on the page of a book, or the moving images of film. It captures a living piece of the way its designers and programmers think. Imagine how much we could learn from 1000-year-old software.